An attorney for Horowitz, who joined Fox Sports National Networks in May 2015 and served as president, immediately fired back.

"The way Jamie has been treated by Fox is appalling," attorney Patricia L. Glaser said in a statement. "At no point in his tenure was there any mention by his superiors or human resources of any misconduct or an inability to adhere to professional conduct."

Glaser said that Horowitz "performed in an exemplary fashion. Any slanderous accusations to the contrary will be vigorously defended."